My washing machine has two motors. One is 150W-230v/ac and other is 350W-230v/ac.There is only one combine four wire capacitor of 6+12 MFD. Can somebody tell me which is for which motor?

A meter or color of the leads may help determine.

The plate on the side of the motor should tell you the answer. Otherwise, you need a wiring diagram or trace the wires to the motors. DrTom4444

Just say you don't know how to use a Meter, You don't HAVE to disagree because you don't understand.
Are you in the understanding that a wire may be blue at 1 end and yellow at the other?

What color wires are on the Capacitor?

feerkee, did you give me a red because of the bedbug problem?